diff --git a/include/matador/object/collection.hpp b/include/matador/object/collection.hpp
index 402c6dd..fa3171a 100644
--- a/include/matador/object/collection.hpp
+++ b/include/matador/object/collection.hpp
@@ -8,6 +8,7 @@ namespace matador::object {
 template < class Type >
 class collection {
 public:
+    using value_type = Type;
 
 private:
   std::vector<Type> data_;